/* FS-Cache statistics
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  #define FSCACHE_DEBUG_LEVEL THREAD
  #include <linux/module.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include "internal.h"
  
  /*
   * operation counters
   */
  atomic_t fscache_n_op_pend;
  atomic_t fscache_n_op_run;
  atomic_t fscache_n_op_enqueue;
  atomic_t fscache_n_op_requeue;
  atomic_t fscache_n_op_deferred_release;

  atomic_t fscache_n_op_initialised;

  atomic_t fscache_n_op_release;
  atomic_t fscache_n_op_gc;

  atomic_t fscache_n_op_cancelled;

  atomic_t fscache_n_op_rejected;

  
  atomic_t fscache_n_attr_changed;
  atomic_t fscache_n_attr_changed_ok;
  atomic_t fscache_n_attr_changed_nobufs;
  atomic_t fscache_n_attr_changed_nomem;
  atomic_t fscache_n_attr_changed_calls;
  
  atomic_t fscache_n_allocs;
  atomic_t fscache_n_allocs_ok;
  atomic_t fscache_n_allocs_wait;
  atomic_t fscache_n_allocs_nobufs;

  atomic_t fscache_n_allocs_intr;

  atomic_t fscache_n_allocs_object_dead;

  atomic_t fscache_n_alloc_ops;
  atomic_t fscache_n_alloc_op_waits;
  
  atomic_t fscache_n_retrievals;
  atomic_t fscache_n_retrievals_ok;
  atomic_t fscache_n_retrievals_wait;
  atomic_t fscache_n_retrievals_nodata;
  atomic_t fscache_n_retrievals_nobufs;
  atomic_t fscache_n_retrievals_intr;
  atomic_t fscache_n_retrievals_nomem;

  atomic_t fscache_n_retrievals_object_dead;

  atomic_t fscache_n_retrieval_ops;
  atomic_t fscache_n_retrieval_op_waits;
  
  atomic_t fscache_n_stores;
  atomic_t fscache_n_stores_ok;
  atomic_t fscache_n_stores_again;
  atomic_t fscache_n_stores_nobufs;
  atomic_t fscache_n_stores_oom;
  atomic_t fscache_n_store_ops;
  atomic_t fscache_n_store_calls;

  atomic_t fscache_n_store_pages;
  atomic_t fscache_n_store_radix_deletes;
  atomic_t fscache_n_store_pages_over_limit;

  atomic_t fscache_n_store_vmscan_not_storing;
  atomic_t fscache_n_store_vmscan_gone;
  atomic_t fscache_n_store_vmscan_busy;
  atomic_t fscache_n_store_vmscan_cancelled;

  atomic_t fscache_n_store_vmscan_wait;

  atomic_t fscache_n_marks;
  atomic_t fscache_n_uncaches;
  
  atomic_t fscache_n_acquires;
  atomic_t fscache_n_acquires_null;
  atomic_t fscache_n_acquires_no_cache;
  atomic_t fscache_n_acquires_ok;
  atomic_t fscache_n_acquires_nobufs;
  atomic_t fscache_n_acquires_oom;

  atomic_t fscache_n_invalidates;
  atomic_t fscache_n_invalidates_run;

  atomic_t fscache_n_updates;
  atomic_t fscache_n_updates_null;
  atomic_t fscache_n_updates_run;
  
  atomic_t fscache_n_relinquishes;
  atomic_t fscache_n_relinquishes_null;
  atomic_t fscache_n_relinquishes_waitcrt;

  atomic_t fscache_n_relinquishes_retire;

  
  atomic_t fscache_n_cookie_index;
  atomic_t fscache_n_cookie_data;
  atomic_t fscache_n_cookie_special;
  
  atomic_t fscache_n_object_alloc;
  atomic_t fscache_n_object_no_alloc;
  atomic_t fscache_n_object_lookups;
  atomic_t fscache_n_object_lookups_negative;
  atomic_t fscache_n_object_lookups_positive;

  atomic_t fscache_n_object_lookups_timed_out;

  atomic_t fscache_n_object_created;
  atomic_t fscache_n_object_avail;
  atomic_t fscache_n_object_dead;
  
  atomic_t fscache_n_checkaux_none;
  atomic_t fscache_n_checkaux_okay;
  atomic_t fscache_n_checkaux_update;
  atomic_t fscache_n_checkaux_obsolete;

  atomic_t fscache_n_cop_alloc_object;
  atomic_t fscache_n_cop_lookup_object;
  atomic_t fscache_n_cop_lookup_complete;
  atomic_t fscache_n_cop_grab_object;

  atomic_t fscache_n_cop_invalidate_object;

  atomic_t fscache_n_cop_update_object;
  atomic_t fscache_n_cop_drop_object;
  atomic_t fscache_n_cop_put_object;
  atomic_t fscache_n_cop_sync_cache;
  atomic_t fscache_n_cop_attr_changed;
  atomic_t fscache_n_cop_read_or_alloc_page;
  atomic_t fscache_n_cop_read_or_alloc_pages;
  atomic_t fscache_n_cop_allocate_page;
  atomic_t fscache_n_cop_allocate_pages;
  atomic_t fscache_n_cop_write_page;
  atomic_t fscache_n_cop_uncache_page;
  atomic_t fscache_n_cop_dissociate_pages;

  atomic_t fscache_n_cache_no_space_reject;
  atomic_t fscache_n_cache_stale_objects;
  atomic_t fscache_n_cache_retired_objects;
  atomic_t fscache_n_cache_culled_objects;

  /*
   * display the general statistics
   */
  static int fscache_stats_show(struct seq_file *m, void *v)
  {
  	seq_puts(m, "FS-Cache statistics
  ");
  
  	seq_printf(m, "Cookies: idx=%u dat=%u spc=%u
  ",
  		   atomic_read(&fscache_n_cookie_index),
  		   atomic_read(&fscache_n_cookie_data),
  		   atomic_read(&fscache_n_cookie_special));
  
  	seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u
  ",
  		   atomic_read(&fscache_n_object_alloc),
  		   atomic_read(&fscache_n_object_no_alloc),
  		   atomic_read(&fscache_n_object_avail),
  		   atomic_read(&fscache_n_object_dead));
  	seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u
  ",
  		   atomic_read(&fscache_n_checkaux_none),
  		   atomic_read(&fscache_n_checkaux_okay),
  		   atomic_read(&fscache_n_checkaux_update),
  		   atomic_read(&fscache_n_checkaux_obsolete));
  
  	seq_printf(m, "Pages  : mrk=%u unc=%u
  ",
  		   atomic_read(&fscache_n_marks),
  		   atomic_read(&fscache_n_uncaches));
  
  	seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
  		   " oom=%u
  ",
  		   atomic_read(&fscache_n_acquires),
  		   atomic_read(&fscache_n_acquires_null),
  		   atomic_read(&fscache_n_acquires_no_cache),
  		   atomic_read(&fscache_n_acquires_ok),
  		   atomic_read(&fscache_n_acquires_nobufs),
  		   atomic_read(&fscache_n_acquires_oom));

  	seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u
  ",

  		   atomic_read(&fscache_n_object_lookups),
  		   atomic_read(&fscache_n_object_lookups_negative),
  		   atomic_read(&fscache_n_object_lookups_positive),

  		   atomic_read(&fscache_n_object_created),
  		   atomic_read(&fscache_n_object_lookups_timed_out));

  	seq_printf(m, "Invals : n=%u run=%u
  ",
  		   atomic_read(&fscache_n_invalidates),
  		   atomic_read(&fscache_n_invalidates_run));

  	seq_printf(m, "Updates: n=%u nul=%u run=%u
  ",
  		   atomic_read(&fscache_n_updates),
  		   atomic_read(&fscache_n_updates_null),
  		   atomic_read(&fscache_n_updates_run));

  	seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u
  ",

  		   atomic_read(&fscache_n_relinquishes),
  		   atomic_read(&fscache_n_relinquishes_null),

  		   atomic_read(&fscache_n_relinquishes_waitcrt),
  		   atomic_read(&fscache_n_relinquishes_retire));

  
  	seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u
  ",
  		   atomic_read(&fscache_n_attr_changed),
  		   atomic_read(&fscache_n_attr_changed_ok),
  		   atomic_read(&fscache_n_attr_changed_nobufs),
  		   atomic_read(&fscache_n_attr_changed_nomem),
  		   atomic_read(&fscache_n_attr_changed_calls));

  	seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u int=%u
  ",

  		   atomic_read(&fscache_n_allocs),
  		   atomic_read(&fscache_n_allocs_ok),
  		   atomic_read(&fscache_n_allocs_wait),

  		   atomic_read(&fscache_n_allocs_nobufs),
  		   atomic_read(&fscache_n_allocs_intr));

  	seq_printf(m, "Allocs : ops=%u owt=%u abt=%u
  ",

  		   atomic_read(&fscache_n_alloc_ops),

  		   atomic_read(&fscache_n_alloc_op_waits),
  		   atomic_read(&fscache_n_allocs_object_dead));

  
  	seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
  		   " int=%u oom=%u
  ",
  		   atomic_read(&fscache_n_retrievals),
  		   atomic_read(&fscache_n_retrievals_ok),
  		   atomic_read(&fscache_n_retrievals_wait),
  		   atomic_read(&fscache_n_retrievals_nodata),
  		   atomic_read(&fscache_n_retrievals_nobufs),
  		   atomic_read(&fscache_n_retrievals_intr),
  		   atomic_read(&fscache_n_retrievals_nomem));

  	seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u
  ",

  		   atomic_read(&fscache_n_retrieval_ops),

  		   atomic_read(&fscache_n_retrieval_op_waits),
  		   atomic_read(&fscache_n_retrievals_object_dead));

  
  	seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u
  ",
  		   atomic_read(&fscache_n_stores),
  		   atomic_read(&fscache_n_stores_ok),
  		   atomic_read(&fscache_n_stores_again),
  		   atomic_read(&fscache_n_stores_nobufs),
  		   atomic_read(&fscache_n_stores_oom));

  	seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u
  ",

  		   atomic_read(&fscache_n_store_ops),

  		   atomic_read(&fscache_n_store_calls),
  		   atomic_read(&fscache_n_store_pages),
  		   atomic_read(&fscache_n_store_radix_deletes),
  		   atomic_read(&fscache_n_store_pages_over_limit));

  	seq_printf(m, "VmScan : nos=%u gon=%u bsy=%u can=%u wt=%u
  ",

  		   atomic_read(&fscache_n_store_vmscan_not_storing),
  		   atomic_read(&fscache_n_store_vmscan_gone),
  		   atomic_read(&fscache_n_store_vmscan_busy),

  		   atomic_read(&fscache_n_store_vmscan_cancelled),
  		   atomic_read(&fscache_n_store_vmscan_wait));

  	seq_printf(m, "Ops    : pend=%u run=%u enq=%u can=%u rej=%u
  ",

  		   atomic_read(&fscache_n_op_pend),
  		   atomic_read(&fscache_n_op_run),

  		   atomic_read(&fscache_n_op_enqueue),

  		   atomic_read(&fscache_n_op_cancelled),
  		   atomic_read(&fscache_n_op_rejected));

  	seq_printf(m, "Ops    : ini=%u dfr=%u rel=%u gc=%u
  ",
  		   atomic_read(&fscache_n_op_initialised),

  		   atomic_read(&fscache_n_op_deferred_release),
  		   atomic_read(&fscache_n_op_release),
  		   atomic_read(&fscache_n_op_gc));

  
  	seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d
  ",
  		   atomic_read(&fscache_n_cop_alloc_object),
  		   atomic_read(&fscache_n_cop_lookup_object),
  		   atomic_read(&fscache_n_cop_lookup_complete),
  		   atomic_read(&fscache_n_cop_grab_object));

  	seq_printf(m, "CacheOp: inv=%d upo=%d dro=%d pto=%d atc=%d syn=%d
  ",
  		   atomic_read(&fscache_n_cop_invalidate_object),

  		   atomic_read(&fscache_n_cop_update_object),
  		   atomic_read(&fscache_n_cop_drop_object),
  		   atomic_read(&fscache_n_cop_put_object),
  		   atomic_read(&fscache_n_cop_attr_changed),
  		   atomic_read(&fscache_n_cop_sync_cache));
  	seq_printf(m, "CacheOp: rap=%d ras=%d alp=%d als=%d wrp=%d ucp=%d dsp=%d
  ",
  		   atomic_read(&fscache_n_cop_read_or_alloc_page),
  		   atomic_read(&fscache_n_cop_read_or_alloc_pages),
  		   atomic_read(&fscache_n_cop_allocate_page),
  		   atomic_read(&fscache_n_cop_allocate_pages),
  		   atomic_read(&fscache_n_cop_write_page),
  		   atomic_read(&fscache_n_cop_uncache_page),
  		   atomic_read(&fscache_n_cop_dissociate_pages));

  	seq_printf(m, "CacheEv: nsp=%d stl=%d rtr=%d cul=%d
  ",
  		   atomic_read(&fscache_n_cache_no_space_reject),
  		   atomic_read(&fscache_n_cache_stale_objects),
  		   atomic_read(&fscache_n_cache_retired_objects),
  		   atomic_read(&fscache_n_cache_culled_objects));

  	return 0;
  }
  
  /*
   * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
   */
  static int fscache_stats_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, fscache_stats_show, NULL);
  }
  
  const struct file_operations fscache_stats_fops = {

  	.open		= fscache_stats_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,

  	.release        = single_release,

  };